/*!
 *****************************************************************************
 * @file:    AD7791.c
 * @brief:   AD7791 converter
 * @version: $Revision$
 * @date:    $Date$
 *-----------------------------------------------------------------------------
 *
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 *
 *****************************************************************************/

#include <ADuCM360.h>
#include <SpiLib.h>
#include <DioLib.h>

#include "AD7791.h"
#include "Communication.h"
#include "Timer.h"
#include "math.h"


/**
   @brief Initializes ADC

   @return none

**/
void AD7791_Init (void)
{
   DioPulPin(CSAD7791_PORT, PIN5, 0);         /* Disable the internal pull up on CS pin */
   DioOenPin(CSAD7791_PORT, PIN5, 1);         /* Set CS pin as output */

   SPI_Init();                                        /*  Initialize SPI1 Bus */
   AD7791_Reset();                                    /* Reset the converter */

   SPI_Write(MODE_WRITE, 0x00, SPI_WRITE_ADC_REG);     /* Mode register value (single conversion, bipolar coding, unbuffered mode) */
   SPI_Write(FILTER_WRITE, 0x07, SPI_WRITE_ADC_REG);   /* Filter register value (clock not divided down, 9.5 Hz update rate) */
}


/**
   @brief Resets ADC to default status

   @return none

**/
void AD7791_Reset (void)
{
   SPI_Write(0x00, 0x00, SPI_WRITE_ADC_RESET);
   timer_sleep (1000);
}


/**
   @brief ADC conversion

   @return uint32_t - conversion result

**/
uint32_t AD7791_DataScan(void)
{

   uint32_t ui32conversionResult;

   ui32conversionResult = SPI_Read(DATA_READ , SPI_READ_ADC_DATA);    /* Read conversion result */

   return ui32conversionResult;                       /* Return conversion result */

}


/**
   @brief ADC register read

   @param ui8regValue  - Register id

   @return uint32_t - register read value

**/
uint32_t AD7791_RegRead(uint8_t ui8regValue)
{

   uint32_t ui32conversionResult;

   ui32conversionResult = SPI_Read(ui8regValue , SPI_READ_ADC_REG);    /* Read conversion result */

   return ui32conversionResult;                       /* Return conversion result */

}


/**
   @brief Convert ADC value into voltage value

   @param u32adcValue  - ADC value

   @return float       - conversion result

**/
float AD7791_ConvertToVolts(uint32_t ui32adcValue)
{
   float f32voltage = 0;

   f32voltage = VREF * ((float)ui32adcValue / (pow(2, 24)));          /* Calculate ADC input voltage value */

   return f32voltage;                          /* Return voltage value */
}
